42450409 has 4 divisors (see below), whose sum is σ = 42760404. Its totient is φ = 42140416.

The previous prime is 42450391. The next prime is 42450451. The reversal of 42450409 is 90405424.

42450409 = T₄₁₄ + T₄₁₅ + ... + T₆₈₇.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24472809 + 17977600 = 4947^2 + 4240^2 .

It is a cyclic number.

It is not a de Polignac number, because 42450409 - 2²³ = 34061801 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42450209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154792 + ... + 155065.

It is an arithmetic number, because the mean of its divisors is an integer number (10690101).

Almost surely, 2^42450409 is an apocalyptic number.

It is an amenable number.

42450409 is a deficient number, since it is larger than the sum of its proper divisors (309995).

42450409 is a wasteful number, since it uses less digits than its factorization.

42450409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309994.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 42450409 is about 6515.3978389658. The cubic root of 42450409 is about 348.8408154102.

The spelling of 42450409 in words is "forty-two million, four hundred fifty thousand, four hundred nine".